Lew pointed out. It was up to the Greek government to do its best to win its creditors’ trust.40 As tension escalated in April, Jason Furman, the latest chairman of Barack Obama’s Council of Economic Advisers, weighed in to comment that a Greek crisis was not “an experiment we want to run.” But when he was asked to rank a disorderly Greek exit on a “scale of one to 10, where the collapse of Lehman is a 10,” Furman opined that “a Greek default would likely register as a six; that is down from eight in 2012.”